Wait for pool-staking to finish loading before allowing unstaking

[timjrobinson]

Description

In https://balancer-labs.sentry.io/issues/4366114128/events/cd83eac018dc40009a09ddbe5d07ee25/ the user went to unstake but it errored that there were no gauges available. This is because the poolGaugesQuery was still loading and useStakePreview doesn't wait for it.

This PR makes useStakePreview check if pool-staking is still loading and doesn't allow the BalActionSteps to continue if it is loading.

Type of change

• Bug fix (non-breaking change which fixes an issue)

How should this be tested?

• Test staking / unstaking pool BPT. It should allow both. It may show loading for longer now than in production because it's waiting for that subgraph query to return, but that's ok.

Checklist:

• I have performed a self-review of my own code
• I have requested at least 1 review (If the PR is significant enough, use best judgement here)
• I have commented my code where relevant, particularly in hard-to-understand areas
• If package-lock.json has changes, it was intentional.
• The base of this PR is master if hotfix, develop if not

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Name	Status	Preview	Updated (UTC)
beta-app-v2	✅ Ready (Inspect)	Visit Preview	Aug 3, 2023 8:30am

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